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Stockholders' Equity (Details Narrative) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2015 | Sep. 30, 2014 | Aug. 30, 2014 | Apr. 30, 2014 | Jun. 30, 2010 | Sep. 30, 2004 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2009
Stock issued for public offering |  |  |  | 12,765,000 |  |  | 12,765,000 |  |  |
Option issued to purchase number of additional common stock |  |  |  |  |  |  | 82,000 | 106,000 |  |
Proceeds from public offering, net |  |  |  | $ 7,020,750 |  |  |  | $ 6,369,000 |  |
Stock-based compensation |  |  |  |  |  |  | $ 456,000 | $ 282,000 |  |
Closing stock price per share |  |  |  |  |  |  | $ 0.16 |  |  |
Aggregate intrinsic value of options exercised |  |  |  |  |  |  | $ 7,000 |  |  |
Number of common stock issued during period |  |  |  |  |  |  | 18,000 | 43,000 |  |
Option exercised during period, value |  |  |  |  |  |  | $ 1,000 | $ 44,000 |  |
Number of option exercised during period |  |  |  |  |  |  | 2,000 | 185,000 |  |
Weighted average grant-date fair value per share price |  |  |  |  |  |  | $ 0.25 | $ 0.30 |  |
Unamortized compensation expense |  |  |  |  |  |  | $ 692,000 |  |  |
Unamortized compensation expense remaining service period |  |  |  |  |  |  | 2 years 10 months 2 days |  |  |
Preferred Stock authorized |  |  |  |  |  |  | 5,000,000 | 5,000,000 |  |
Preferred stock shares issued |  |  |  |  |  |  | 156,000 | 156,000 |  |
Preferred Stock Series A shares outstanding |  |  |  |  |  |  | 156,000 | 156,000 |  |
Common stock shares issued |  |  |  |  |  |  | 92,439,000 | 92,370,000 |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  | $ 156 | $ 156 |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |
Preferred Stock authorized |  |  |  |  |  |  | 10,000,000 |  |  |
Series A Cumulative Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock authorized |  |  |  |  |  |  | 5,000,000 |  |  |
Preferred stock shares issued |  |  |  |  |  |  | 156,000 | 156,000 |  |
Preferred Stock Series A shares outstanding |  |  |  |  |  |  | 156,000 | 156,000 |  |
Dividends payable per share |  |  |  |  |  |  | $ 0.10 | $ 0.10 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock issued for public offering |  |  |  |  |  |  |  | 12,765,000 |  |
Option exercised during period, value |  |  |  |  |  |  |  | $ 1,000 |  |
Common stock shares issued |  |  |  |  |  |  | 46,000 | 35,000 |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  | $ 1.00 |  |  |
Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase number of common stock |  |  |  |  |  |  |  |  | 3,600,000 | 3,000,000
Fair value of the warrants |  |  |  |  |  |  |  |  | $ 1,379,000 | $ 537,000
Risk-free interest rates |  |  |  |  |  |  |  |  | 1.06% | 2.79%
Dividend yield |  |  |  |  |  |  |  |  | 0.00% | 0.00%
Expected volatility |  |  |  |  |  |  |  |  | 80.25% | 78.10%
Term of weighted-average assumptions |  |  |  |  |  |  |  |  | 5 years | 8 years
Number of warrants exercised during period |  |  |  |  |  |  |  |  | 0 | 0
2004 Performance Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  |  | 2,500,000 |  |  |  |
Options outstanding |  |  |  |  |  |  | 53,000 |  |  |
1995 Employee Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  |  | 77,000 |  |  |  |
2010 Amended Performance Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  | 6,000,000 |  |  |  |  |
Options outstanding |  |  |  |  |  |  | 2,511,000 |  |  |
Number of common stock issued during period |  |  |  |  |  |  |  | 119,000 |  |
Number of restricted stock unit vested during period |  |  |  |  |  |  |  | 173,000 |  |
2010 Amended Performance Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  | 6,000,000 |  |  |  |  |
2010 Amended Performance Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  |  |  | 12,000,000 |  |  |  |  |
2014 Inducement Plan [Member] |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized to issue |  |  | 4,250,000 |  |  |  |  |  |  |
2014 Inducement Plan [Member] | Mr Krishnan [Member] |  |  |  |  |  |  |  |  |  |
Option issued to purchase number of additional common stock | 750,000 | 3,500,000 |  |  |  |  |  |  |  |
2014 Inducement Plan [Member] | First Anniversary [Member] |  |  |  |  |  |  |  |  |  |
Option expected to vest during period, percentage | 25.00% |  |  |  |  |  |  |  |  |
2014 Inducement Plan [Member] | 36 Substantially Equal Monthly Installments Thereafter [Member] |  |  |  |  |  |  |  |  |  |
Option expected to vest during period, percentage | 75.00% |  |  |  |  |  |  |  |  |
Roth Capital Partners, LLC [Member] |  |  |  |  |  |  |  |  |  |
Stock issued for public offering |  |  |  | 11,100,000 |  |  |  |  |  |
Sale of stock price per share |  |  |  | $ 0.55 |  |  |  |  |  |
Option issued to purchase number of additional common stock |  |  |  | 1,665,000 |  |  |  |  |  |

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